The nutritive value of veld as indicated by faecal phosphorous and nitrogen and its relation to the condition and movement of prominent ruminants during the 1992-1993 drought in the Kruger National Park [South Africa]

afrique du sud azote drought faeces feces fosforo heces national parks nitrogen nutritive value parc national parques nacionales phosphore phosphorus rumiante ruminant ruminants south africa valeur nutritive valor nutritivo veld